Polishing runner



Apfil 13 1926.

F. GELSTHARP POLISHING RUNNER original Filed June 16, 1923 INVE/VTUR Patented Apr. 13, 1926.

UNITED STATES PATENT FREDERICK GELSTIIARP, OF TARENTUM, PENN S YLYANIA, ASSIGNOR TO PITTSBURGH PLATE GLASS COMPANY, A CORPORATION OF PENNSYLVANIA.

POLISHING RUNNER.

Application tiled June 16, 1823, Serial No. 845,857. Renewed October 16, 1925.

To all whom. it may co'mem:

Be it known that I, FREDERICK GELSTHARP,

a citizen of the United States, and a resiwherein:

dent of Tarentum, in the county of Allegheny and Statejof Pennsylvania, have 7 made a new and useful Invention in Polishing Runners, of which the following is a specification.

The invention relates to the blocks or'r'um ners employed in polishing plate glass and involves an improvement over the construction'of my application, Serlal Number the assembly of blocks and felts isrendered more convenient, the. labor incident to refelting is reduced, and therequirement of removing the runner blocks from the machine in order to refelt them is avolded. Certain embodimentsof the invention are illustrated in the accompanying drawings Figure 1 is a vertical section through a olishing runner embodying the invention.-

ig. 2 is a bottom lan view of the device of Fig. 1. And Fig. 3 is a bottom planview of a modified form of runner.

. Referring to Figs. 1 and 2, 1 is a metal sup orting block or plate; 2 is the framewor from which the lock is supported over the. olishin table; 3 is the spindle b v p g supporting frame 2, the felts 10-bein kept in stock with the clips cemented 't ereto means of ,which the block or plate is mounte. for universal movement in order to ad uSt itself to the surface of the glass over which 'the block is moved; 4. are securing or ho lding clips or plates; .and5 is the polishlngpador felt which is secured at its corners to of the. clamp 7, which in turn is secured by the bolts 8, this beingla common method of securing a polishing ock to its spindle and permitting the necessary movement so that the block may adjust itself to the glass. The s indle 3 is held against withdrawal from t e frame 2, when the table beneath the runners is removed, by means of the cotter in 9. p The block 1 is refer-ably square as is also the felt sheet 5, ut this is not necessarily the case as some-other angular shape might be employed. The block and felt do not need to correspond 1n shape and size, al-

I though this is preferably the case, all that tire upper surface of the felt or pad: 5. The

felt V5 is secured to the corner clips {by means of the cement 10, which for the pur-- pose of illustrationlis shown as a relatively thick layer. The clips are preferably. of

triangular shape as indicated in Fig. 2-and are providedv with upwardly extending shanks 11 upon which are 'threaded the clamping nuts 12. a Themeithod of fastenin thefelt 5 to the block 1 as above describe insures sufiicient security and the felt assumes a perfectly flat,

osition and wears uniformly} throughout its area. As pointed out in my copending appllcatlon heretofore referred to, the polishing effect of the square felt is more ra id than with the ordinary type of polishing block of circular shape, but having the same rubbing area. The use of bling the blocks and felts. The clips can be made relatively thin and cheap, and little the clips 4 provides a conven lent method of assembling and disassemloss is involved in throwing them away. with the worn felt, in case it is not found to be worth while to detach them for'reuse. I The arrangement makes it easy and convenient to'detacha felt and re lace it by another one without removing t e runner from its ready for use. The clips, are as illustrated, seated in recesses in the lower face of the polishing block so that the lower face of the felt is not pressed downward atthe corners, but lies in a perfectly true plane.

Fig. 3 illustrates the invention as a plied to a circular polishing block 13, they elt 14 being in this instance cemented to the annular securing member 15 which corresponds in function to the cli se of the Fig. 1 construction. The annu ar member is held in place by means of upstanding shanks 16 which project through the metal block 13 'and are held by nuts asin the construction to the block consisting'of means cemented to the upper surface of the felt sheet at the edge thereof and provided with holding members extending upwardly through the block, and releasable securing means for the upper ends of said members.

2. In combination, a plate glass polishing runner comprising a supporting block, re-

cessed on the lower face at the edge thereof,

a sheet of polishing felt on the lower face of the block, and means for securing the felt to the block consisting of means cemented to the upper surface of the felt sheet and adapted to fit into the recessed lower face of the block and provided with holding members extending upwardly through the block, and releasable securing means for the upper ends of said members.

3. In combination, a plate glass polishing runner comprising an angular sheet of felt,

said shanks, and securing nuts for said shanks.

In testimony whereof, I have hereunto subscribed my name this 9th day of June,

FREDERICK GELSTI-IARP. 

